Theorem rnun 5055

Description: Distributive law for range over union. Theorem 8 of [Suppes] p. 60. (Contributed by NM, 24-Mar-1998.)

Assertion

Ref	Expression
rnun	|- ran ( A u. B ) = ( ran A u. ran B )

Proof of Theorem rnun

Step	Hyp	Ref	Expression
1		cnvun 5052	. . . 4 |- `' ( A u. B ) = ( `' A u. `' B )
2	1	dmeqi 4846	. . 3 |- dom `' ( A u. B ) = dom ( `' A u. `' B )
3		dmun 4852	. . 3 |- dom ( `' A u. `' B ) = ( dom `' A u. dom `' B )
4	2, 3	eqtri 2210	. 2 |- dom `' ( A u. B ) = ( dom `' A u. dom `' B )
5		df-rn 4655	. 2 |- ran ( A u. B ) = dom `' ( A u. B )
6		df-rn 4655	. . 3 |- ran A = dom `' A
7		df-rn 4655	. . 3 |- ran B = dom `' B
8	6, 7	uneq12i 3302	. 2 |- ( ran A u. ran B ) = ( dom `' A u. dom `' B )
9	4, 5, 8	3eqtr4i 2220	1 |- ran ( A u. B ) = ( ran A u. ran B )

Syntax hints:   = wceq 1364   u. cun 3142   `'ccnv 4643   dom cdm 4644   ran crn 4645

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2171

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2176  df-cleq 2182  df-clel 2185  df-nfc 2321  df-v 2754  df-un 3148  df-in 3150  df-ss 3157  df-sn 3613  df-pr 3614  df-op 3616  df-br 4019  df-opab 4080  df-cnv 4652  df-dm 4654  df-rn 4655

This theorem is referenced by:  imaundi  5059  imaundir  5060  rnpropg  5126  fun  5407  foun  5499  fpr  5719  fprg  5720  sbthlemi6  6991  exmidfodomrlemim  7230